Scientists have found that the hedgehog signaling pathway is active in embryos during the early development of the neural tube, motor neuron specification, left-right symmetry, body plan, limbs, and retinas. In the 1950s, sheep feeding on the corn lily (Veratrum species) in mountain pastures gave birth to a number of lambs with only one eye. These one-eyed lambs were explained when the compound, now known as cyclopamine, was discovered in the corn lily. Explain how a failure to have cell division occur at a critical time during development could lead to lambs with one eye

(me out over the last several centuries, scientists have made the following broad observations while investigating several branches of the life sciences: -the fossil record shows that different types of organisms have existed at different times in earth's history. -many organisms have similar body structures that seem to be adapted to different ways of living in their environment. -organisms of different species often share similarities in stages of embryonic development. -many species share genetic similarities, and almost all organisms use the same basic building blocks to construct proteins. -often, the extent of two species' similarities can be predicted from their geographic closeness to each other. -a great deal of change has been observed among species that have experienced strong selective pressures through many generations. scientists have carefully considered and rigorously tested the observations listed above. when scientists offer a of these observations, they are making 1.) testable explanation, deductive explanation 2.) scientific interference, scientific law